Start documenting everything now. Take pictures of the packaging and the damages to the contents. Be sure to write down the day, date, time, and name of anyone you talk to about this, with the company name and include a brief summary of what both you said. That includes shipper, seller, manufacturer, yourself, etc. As difficult as it is, always remain professional, no matter how offensive something they say may seem. This will get you further in the long run.
Be sure to refer to your written log whenever you speak with someone new and reference it, "When I spoke with John at Company X on Wednesday April 2nd, at 3pm, he said that..." Then write that down. This way if you get the run around, you can clearly point out every party involved and what they had to say.
Jack